@BOOK {ASADU:1999a, title = {Soils of arable crop fields in sub-Saharan Africa; focus on cassava-growing areas: COSCA working paper, No. 18}, author = {Asadu, C. * and Nweke, F. }, series = {COSCA working paper}, year = {1999}, number = {18}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, isbn = {978-131-157-6}, note = {RTB; Root and Tuber; Cassava.; 182p. File is too large to upload- table of content attached}, }